Thank you for mentioning them. But I am not looking for browser extensions but "real" NIP-46 implementations over nostr relays on the web or on Android.
How about this?
https://github.com/nostr-connect/nostrum
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Yes 😃. That is exactly what I am looking for. Thanks.
Any other solutions?
I haven’t seen anything else, but I’m not exactly the most observant at times (hence me confusing your request for a signing app with a browser extension 🤦🏻♂️)